Knuckles | Sonic &

The most distinctive feature of Sonic & Knuckles is its unique cartridge design. The top of the cartridge features a flip-open slot that allows players to "lock on" other games.

Locking on Sonic 2 allows players to play through that entire game as Knuckles the Echidna , utilizing his unique abilities to find secrets unreachable by Sonic. Sonic & Knuckles

Inserting almost any other Genesis cartridge (including the original Sonic 1 ) grants access to thousands of unique "Blue Sphere" special stages. Gameplay and Story The most distinctive feature of Sonic & Knuckles

Combining the two games creates the definitive experience, allowing players to play through all 14 zones as Sonic, Tails, or Knuckles, with the ability to save progress. with the ability to save progress.